In view of the fact that the global change which was mainly marked by warming resulted in that the climate change rate increased,the extreme weather and climate events and disasters were more frequent,and the risk of population,agricultural economic production and infrastructure were enlarged.A case on the characteristics of extreme rainfall in Yanan of 2013and its severe erosion on the terraces was analyzed which was based on years of daily rainfall data of Yanan station and terraces erosion field measuring data.The results were showed as bellows:(1)The total extreme rainfall of Yanan in 2013reached 959mm,448.8 mm higher than the mean annual rainfall(1951-2012).Rainfall from July to September reached 761mm, which accounted for 79.4%of the whole year and among which the maximum monthly rainfall happened in July(568mm),reaching the standard of million years;(2)The number of erosive rainfall and rainstorm was much more than before and the total amount of rainstorm was large.Meanwhile,the extreme rainfall showed new changes of short duration and moderate intensity,moderate duration and high intensity,long duration, strong erosion and weak sediment transport;(3)The contiguous terraces were eroded seriously in the extreme rainfall.The soil erosion modulus of terrace had significant correlations with relative elevation and catchment area.The erosion of the moderate and lower terraces was serious and the maximum soil erosion modulus reached 54 049.50t/km~2.This study would provide the basis for the design of agricultural soil and water conservation terrace engineering,and also provide support to take permanent and temporary measures to prevent the extreme rainfall under climate change conditions.